Fix projecting complex type in ProjectionBinder

[roji]

Fixes #37551

[Copilot]

Pull request overview

This PR fixes issue #37551 where EF Core was including unnecessary columns in generated SQL when projecting complex types alongside non-primitive closure variables (reference type closures). The bug affected performance, especially with TPH hierarchies, and directly impacted ASP.NET Core OData's $select functionality.

Changes:

• Modified projection binding logic to properly handle complex types returned by TranslateProjection
• Added comprehensive test coverage across multiple association patterns and database providers

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/EFCore.Relational/Query/Internal/RelationalProjectionBindingExpressionVisitor.cs	Fixed complex type projection by handling RelationalStructuralTypeShaperExpression and CollectionResultExpression cases with base.Visit() instead of treating them as scalar SQL expressions
test/EFCore.Specification.Tests/Query/Associations/AssociationsProjectionTestBase.cs	Added new test case Select_associate_and_target_to_index_based_binding_via_closure that reproduces the bug scenario with an object closure
test/EFCore.Specification.Tests/Query/Associations/OwnedNavigations/OwnedNavigationsProjectionTestBase.cs	Added override to ensure proper tracking behavior for the new test in owned navigation scenarios
test/EFCore.SqlServer.FunctionalTests/Query/Associations/ComplexTableSplitting/ComplexTableSplittingProjectionSqlServerTest.cs	Updated SQL baselines showing removal of unnecessary columns (Id, Name, OptionalAssociate fields) and added SQL verification for the new test
test/EFCore.SqlServer.FunctionalTests/Query/Associations/ComplexJson/ComplexJsonProjectionSqlServerTest.cs	Updated SQL baselines and added test override demonstrating minimal column selection with complex JSON
test/EFCore.SqlServer.FunctionalTests/Query/Associations/OwnedTableSplitting/OwnedTableSplittingProjectionSqlServerTest.cs	Added SQL baseline verification for owned types with table splitting
test/EFCore.SqlServer.FunctionalTests/Query/Associations/OwnedNavigations/OwnedNavigationsProjectionSqlServerTest.cs	Added SQL baseline verification for owned navigations
test/EFCore.SqlServer.FunctionalTests/Query/Associations/Navigations/NavigationsProjectionSqlServerTest.cs	Added SQL baseline verification for regular entity navigations
test/EFCore.Cosmos.FunctionalTests/Query/Associations/OwnedNavigations/OwnedNavigationsProjectionCosmosTest.cs	Documented known Cosmos provider limitation with the scenario (expects EqualException for non-tracking queries)